Limitting bandwidth

[Amin Omidzadeh Khosrowshahi]

Happy Y2K 

I have a local network with a ppp connection to my ISP and a class C IP, 
My gateway is a linux machine and I have installed a transparent proxy
on it with squid and ipchains (A). This network serves two other
ppp connections which are acting as a send line for two tvro dishes and are
excluded from my proxy via (B) machine.
now, I have two questions:

1- How can I limit  the bandwidth of these two connections which
     don't use my proxy from (A) ?

2- How can I limit the bandwidth of my local hosts which use proxy?

                                            (A)
                                 |------------|                        
                                 |  gw  and proxy  | --->My ISP
                                 |   *.*.*.1             |
                                 |------------|
                                            |
                                            |
                              My local Network
          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                                            (B)                     /
PPP1 ( *.*.*.248 ) ---->|-----------|           /
PPP2 ( *.*.*.252 ) ---->|  *.*.*.2            |           /
                                   |-----------|          /
                                            |                       /
                                            |                       /
                                        .........                     /
                                                                   /
                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~/
                                       

Many thanks in advance
Amin 
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